There will never be such disclosure at all. They will just "recognize "that some of the 10 % of UFOs remain Unidentified. That is all.
Besides, the alien Entities seem to agree with the cover-up.
The Aliens, (if they are aliens) are not better than the gov.
Of course, the Exos keep the ¨"soon disclosure¨´ myth because they want to sell books, videos, and galactic diplomacy courses.
When the thing doesnt work, they can invent a neocult as Boylan did.
This is ALL THERE IS about cover'up and disclosure.